Water-purifying system for swimming-tanks.



No. 883,467. vTATENTEII MAE. 31, 1908.

' G. D. MITCHELL. E I

WATER EUEIEYINE SYSTEM EOE SWIMMING TANKS.

APPLICATION FILED MAR. 10. 1905.

. 'mesa/62s: 75 7K 5ft/(1764077 vUNITED 'STATES PATENT onirica.

GARRYT `D.MITCHELL, OF CHELSEA, MASSACHUSETTS, ASSIGNOR TO THE SWIMMING POOL FILTRATION COMPANY, A CORPORATION OF MASSACHUSETTS..

WATER-PURIFYING SYSTEM FOR SWIMMING-TANKS..

To all whom it may concern.'

Be it known that I, GARRYT D. MITCHELL, a citizen of the United States, residing in Chelsea,.in the county of Suffolk and State of Massachusetts, have invented an Improvement in Water-Purifying Systems for Swimming-Tanks, of which the following descrip tion, in connection with the accompanying drawings, is a specification, like letters on the drawings representing likeparts.

The present invention relates toa Water purifying system for swimming tanks, the

purpose of the invention being to connect a swimming tank with means for purifying the water, such as a filtering bed, so that the water can be circulated through the purifying means froni'time to'time, the same water thus being repeatedly used, and being at all times clean and pure.

This results'not only in a saving of the water used, but also ina saving of-heat when the water is heated, since, in circulating the water, instead of replacing it, a considerable `vportion of the heat 'i is retained.

As a secondary feature of the invention, Iv

provide the circulating pipes with a 'heating appliance, it being practicable, therefore, for heating purposes, to circulate the water past the heating appliance, without passing the ymal level of the water in the tank; Fiff 2 is a Vertical section through the middle of Fig. l and Fig. 3 is a vertical section on a plane transverse to that of Fig. 2, on the line w3 of F ig. l, looking towards the left.

The swimming tank a is provided with .an outlet pipe b at'or near the bottom of the tank, which communicates through a pipe c with a pipe d leading to the purifying means, and is hereinshown as openingover a suitable filter bed e. The filter bed may be of any suitable kind, but is herein shown as having the characteristics of the filter bed set forth in PatentNo. 732,208, granted 'to me June 30, 1903.

The water is discharged upon the top of the filter bed, and falls into a trough e, the

purpose of which is to protect `the upper" ayer of the filter, which is of comparatively -fine material, such as sand, which would be thereof.

. or through thelter.

vSpecification of yLetters Patent. l Patented March 81, 191518. Application mea March 1o, 1905. `seria1 N5. 249,355.

the filter, accumulates in a wellf, and circulation is maintained by means of a pump of any suitable'kind, herein 4shown as a centrifugal pump driven by a motor g, the water fromlthe pump being drawn through a pipe h which opens ath2 4into the tank near the top The levelof the water is thus maintained just abovethe pipe d so that the water will flow out by gravity into the filter. As herein shown, the-pipe d is provided with a branch d2 leading from the tank just below the Water level thereof, lthe said pipe being controlled by avalve da so that by opening said valve, the surface water will flow directly through the pip'esd2 and d to the filter, the purpose being to carry off any scum or foreign subs tance which may be floating on the top of the tank. v

The apparatus may be provided with a h eateril so positioned as to influence the circulating water, the said heater lbeing herein lshown as surrounding the pipe h so as t0 heat the water on its Vway to the tank.

The apparatus may be further provided with a reservoir 7c which receives the water from the filter, the said reservoir, being of sufficientl capacity to insure a plentiful,

supply of pure water at all times, so that the contents of the tank can be drawn off and pure water supplied in its place Without waiting for the water to ercolate through the filter. If it is desirab e to circulate the Water for heating purposes only, without passing the same througl the filter, the reservoir lc may be directly connected with the pipe b lthrough-a pipe controlled by a' valve Ich In this case, the valves d3 and c2 in the pipje 1c are closed, and the Water ciroulates directlythrough the pipe b, reservoir lc and pipe h, while, however, the reservoir erforms a useful function, it may obviously "e dis ensedV with, and the water circulate directly past the heating appliance, The pipe l) is shown as provided with a branch. b2 controlled by a .100

valve b3 for the purpose of drawing off theto empty the same for pur oses. O aims.

l. The combination with a swimming tank; vof a filter adjacent` thereto; a pipe leading from the bottom of the 4tank and havingcleaning, or other ontents of -the tank, if desired, in order `an outlet above the top of the filter; a pipe p `leading from a point below the filterto t e pipe which leads frorii'below the filter; and

vided with a valve; a pi e leading from the bottom ofthe tank to t e top of the tank and providedwith a valve; anda pi e lead- 15 ing from the -reservoir to the top of tliie tank, substantially as described. v In testimony whereof, I have signed my name to this specication in thepresence of two subscribing witnesses.

MITCHELL.

top of the tank', a pump to convey filtered water to the tank through said pipe; a heat ing device adjacent to said pipe; a by-pass between the bottornof the/tankv and the means for controlling the pipes whereby water can be circulated and heated without being rIpassed through the lter.

2. l 'he combination with a swimminv tank; of a filter-bed;y a reservoir below sai i iilter bed; a pipe leading from the bottom of the tank directly to said reservoir and pro; l

4GrARRYT D.

Witnesses: y y

, MARGARET H. CovENEY,

lHENRY J. LIVERMORE. 

